How do you find the resistance and reactance of A cable?
CALCULATION OF CABLE RESISTANCE
Table of Contents
- Hence R = 22.5/10 = 2.25 Ohms per km.
- Length of conductor = 500m =500/1000 = 0.5km.
- Therefore resistance of copper conductor = 2.25 x 0.5 =1.125 Ohms. Similarly for Aluminium,
- R = 36/S(c.s.a)
- Again S = 10mmsq.
- Hence R = 36/10 = 3.6 Ohms per km.
- Length of conductor = 0.5km.
How do you find the resistance of A conductor?
The resistance of a conductor is directly proportional to its length (L) as R ∝ L.
What is the resistance of 1.5 mm cable?
Electrical resistance in plain copper or aluminum wires.
| Cross Sectional Area (mm2) | Resistance (ohm/km) | |
|---|---|---|
| Copper | Aluminum | |
| 1.0 | 17.2 | 26.5 |
| 1.5 | 11.5 | 17.7 |
| 2.5 | 6.9 | 10.6 |
What is the resistance of A cable?
Resistance describes how strongly a given cable opposes the flow of an electric current, and conductance measures a wire’s ability to conduct it. There are also two physical quantities associated with them – electrical resistivity and electrical conductivity.
What is reactance and resistance?
Resistance and reactance are the properties of an electrical circuit that opposes the current. The main difference between reactance and resistance is that resistance measures the opposition to a flow of current, whereas reactance measures the opposition to a change in current.
What is conductor reactance?
Reactance is present in addition to resistance when conductors carry alternating current. Reactance also occurs for short intervals when direct current is changing as it approaches or departs from steady flow, for example, when switches are closed or opened.
What causes resistance in a conductor?
cause of the resistance of a wire: Resistance of a given conducting wire is due to the collisions of free electrons with each other, the ions or atoms of the conductor and the walls of the conductor during their drift towards the positive end of the conductor which in turn depends upon the arrangements of atoms in the …
What are the 4 factors affecting the resistance of a conductor?
There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material. When there is current in a conductive material, the free electrons move through the material and occasionally collide with atoms.
What is cable reactance?
reactance, in electricity, measure of the opposition that a circuit or a part of a circuit presents to electric current insofar as the current is varying or alternating. Steady electric currents flowing along conductors in one direction undergo opposition called electrical resistance, but no reactance.
What is resistivity formula?
Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l. The unit of resistance is the ohm.
What is specific resistance of a conductor?
Specific Resistance (”ρ”) is a property of any conductive material, a figure used to determine the end-to-end resistance of a conductor given length and area in this formula: R = ρl/A. Specific resistance for materials are given in units of Ω-cmil/ft or Ω-meters (metric).
What is called reactance?
What is called resistance?
Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.
What is difference between resistance and reactance?
Why it is called reactance?
Reactance, denoted X, is a form of opposition that electronic components exhibit to the passage of alternating current (alternating current) because of capacitance or inductance. In some respects, reactance is like an AC counterpart of DC (direct current) resistance.
What affects resistance of a conductor?
The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.
Which factors affect the resistance of a conductor?
There are several factors that affect the resistance of a conductor;
- material, eg copper, has lower resistance than steel.
- length – longer wires have greater resistance.
- thickness – smaller diameter wires have greater resistance.
- temperature – heating a wire increases its resistance.
What are five things that affect the resistance of a conductor?
The electrical resistance of a conductor is affected by the following factors:
- The temperature of the conductor.
- The length of the conductor.
- The cross-sectional area of the conductor.
- The nature of the material of which the conductor is made.
What is the effect of resistance in conductors?
When the resistance in a circuit increases, the current decreases. Adding more resistance increases the opposition to the flow of charge so it is more difficult for charge to move through the circuit. Therefore there is less current (as current is the rate of flow of charge).
What is resistance and reactance?
What is difference between impedance and reactance?
Reactances resist currents without dissipating power, unlike resistors. Inductive reactance increases with frequency and inductance. Capacitive reactance decreases with frequency and capacitance. Impedance represents total opposition provided by reactance and resistance.
What is the unit of resistance?
The unit of the electrical resistance, measured with direct current, is the ohm (abbreviated Ω), named after the German physicist and mathematician Georg Simon Ohm (1789-1854). According to ohm’s law, the resistance R is the ratio of the voltage U across a conductor and the current I flowing through it: R = U / I.
Why is it called specific resistance?
Specific resistance is defined as the resistance offered per unit length and unit cross-sectional area when a known amount of voltage is applied.
What is the SI unit of resistance?
The SI unit of electric resistance is the ohm (Ω). 1 Ω = 1 V/A.